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Commitments and Contingencies (Details) $ in Thousands	Sep. 30, 2019 USD ($) property	Dec. 31, 2018 USD ($)
Environmental Indemnity Agreement
Number of properties which were provided environmental indemnifications | property	3
Maximum additional costs agreed to be paid by the entity under environmental indemnification agreement	$ 19,000
Carrying Value	1,862,301	$ 1,823,909
Development and Redevelopment Obligations
Environmental Indemnity Agreement
Purchase obligations	217,100
Tenant and Other Capital Improvements
Environmental Indemnity Agreement
Purchase obligations	60,800
Third Party Construction
Environmental Indemnity Agreement
Purchase obligations	13,500
Other Obligations
Environmental Indemnity Agreement
Purchase obligations	1,600
Specialty Tax Guarantee | Anne Arundel County, Maryland | Tax Incremental Financing Bond
Environmental Indemnity Agreement
Carrying Value	$ 34,000

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Maximum additional costs agreed to be paid by the entity under environmental indemnification agreement

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- Definition

Represents the number of properties in New Jersey which were provided environmental indemnifications by the entity.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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-Name Accounting Standards Codification
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